What does a higher voltage during the synchronization of generators indicate when lamps are dark?

A higher voltage during the synchronization of generators, especially when lamps are dark, signifies that the voltage levels need to be adjusted to achieve proper synchronization. In the synchronization process, generators must be aligned in terms of voltage, frequency, and phase sequence before they can be connected to the power system.

When the voltage is higher, it indicates that the generator is ready but must be brought to match the bus voltage for safe and effective synchronization. This high voltage condition serves as a signal that adjustments are required, reflecting the operational requirements needed for successful synchronization rather than signaling an error or fault in the system. Proper synchronization ensures the stability and harmony of electrical systems, preventing disruptions that could arise from mismatched voltages.